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Commit 494bfec9 authored by Shawn Guo's avatar Shawn Guo Committed by Mike Turquette
Browse files

clk: add of_clk_src_onecell_get() support 



For those SoCs that have hundreds of clock outputs, their clock
DT bindings could reasonably define #clock-cells as 1 and require
the client device specify the index of the clock it consumes in the
cell of its "clocks" phandle.

Add a generic of_clk_src_onecell_get() function for this purpose.

Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
Reviewed-by: default avatarRob Herring <rob.herring@calxeda.com>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 09b9b2b2

drivers/clk/clk.c

+14 −0
Original line number Diff line number Diff line
@@ -1587,6 +1587,20 @@ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec, 
}

EXPORT_SYMBOL_GPL(of_clk_src_simple_get);



struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data)

{

	struct clk_onecell_data *clk_data = data;

	unsigned int idx = clkspec->args[0];



	if (idx >= clk_data->clk_num) {

		pr_err("%s: invalid clock index %d\n", __func__, idx);

		return ERR_PTR(-EINVAL);

	}



	return clk_data->clks[idx];

}

EXPORT_SYMBOL_GPL(of_clk_src_onecell_get);



/**

 * of_clk_add_provider() - Register a clock provider for a node

 * @np: Device node pointer associated with clock provider

include/linux/clk-provider.h

+5 −0
Original line number Diff line number Diff line
@@ -361,6 +361,11 @@ int of_clk_add_provider(struct device_node *np, 
void of_clk_del_provider(struct device_node *np);

struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,

				  void *data);

struct clk_onecell_data {

	struct clk **clks;

	unsigned int clk_num;

};

struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);

const char *of_clk_get_parent_name(struct device_node *np, int index);

void of_clk_init(const struct of_device_id *matches);